Furnace-grate.



T. K. NAFUS.

FURNACE GRATE.

APPLICATION FILED APR. 1. 1914.

Patented July 20, 1915.

COLUMBIA PLANOGRAPH c0., WASHINGTON, D. c.

THOMAS K. NAFUS, or LA sn mnnnw YORK.

List-7,536.

, FURNA E-Gimme;

Specification of Letters Patent. Patented July 29,, 1915.

Application filedApril 7,1914. Serial No. 830,312.

To all whom it may concern Be it known that I, THOMAS NAFUS, a

citizen of the United States, residing in the village of La Salle, county of Niagara, Stateof New York, have invented a new and use ful Furnace-Grate, of which the following is v a specification.

My invention relates to improvements in grates, and more particularly to improvements in air-supplying means for furnace grates. V I

The object of my invention is to provide a grate made up of grate units each of which is provided with improved air-conducting means which produces a more uniform and complete combination of the combustibles and the oxygen supplied; to prevent ashes fromfalling through the grate when com bustion is taking place; to provide means for cutting off orremoving ashes when desired; and to provide means for raising or lowering the air-feeding stems-(hereafter described) to adapt the same to a thick or thin bed of fuel.

Referring to the drawings herewith, Fig ure 1 is a top ,plan View of one of my grate units. Fig. 2 is an end elevation. Fig. 3 isv a side elevation. Fig. 4 is a plan of a battery of units with their grate-bar con nections. Fig. 5 is an end elevation of a group of units, one being shown partlyin section.

Each unit consists of a hub portion composed of two cylindrical parts B and C of different diameters but cast integrally as shown,the diameter of the part B being greater than that of the part C, the axial length of the two portions being equal so that they will fit together, right and left, as clearly shown in Figs. 4 and 5. These hub portions are provided with air chambers E, cylindrical in form, the ends of which chambers are partially closed down into squared openings 01, within which the squared portions of the grate-rods H fit. Leading from these air chambers E are air ducts G, which are tapering and which have their smaller orifices upon the cylindrical surfaces of the parts B and C. These ducts,

extending radially as shown, serve to admit air from the under side of the grate into the air chambers E and to discharge it into the fuel upon the upper side of the grate. Extending upwardly from the cylindrical portions B are air-feeding stems A, which are tapered externally, preferably, which are open at their outer ends and which openings connect with the air chambers E by passages or ducts K. perforations in their sides, as shown at G in Figs. 3 and 5, for the exit of air at points lower than the end orifices. The units thus described are arranged right and left, or

alternately reversed axially, as shown in Flg. l. and'are carried'by grate-rods H,

whi'chhave squared portions to fit the square holes cl, andwhich are supported ingrateframe 2' by being journaled-therein as shown' at J. The right-and-left arrangement of these units is indicatedby the reference characters R and L in'Figs. i and 5. The grate-rods H are secured against axial movement in any desired manner (not shown), and have their outer ends squared (not shown) to receive ashaker, Each of the units has a notch or cut awayvpor'tion fin.

the cylindrical portion B, as clearly shown These air'feeding stems have in Figs. 2 and 5. These notches are'so ar-- ranged that, when the grate is in the normal position, there are no spaces between the units. But when the units are rockedby turning the grate-rods to the position shown in broken outline in Fig. 5, these notches make openings between the units through which the ashesmay pass down or be cut off in the usual manner.

It will now be seen that the air is drawn or forced in through the radial ducts G having their orifices upon theiunder sidesof the units into the chambers'E, and from the chambers E will pass through the ducts G having their orifices in the fire area, and

scribed and shown but a single battery of units, and that such battery may be extended or duplicated to any desired extent to form any desired grate area.

I claim: v

1. A grate of the type described composed of a plurality of grate units, each unit comprising a body portion made up of two cylindrical parts of different diameters but equal in axial length, having an air chamber and air ducts leading from said chamber to the cylindrical surfaces, an air-feeding stem on each unit capable of projecting upwardly into the fire area and having its air passage connected With said air chamber, and means for revolubly mounting said units on grate bars.

2. A grate of the type described composed of a plurality of grate units, each unit comprising a body portion made up of tWo cylindrical parts of different diameters but equal in axial length, having an air chamber and air ducts leading from said chamber to the cylindrical surfaces, an air-feeding stem on each unit capable of projecting upwardly into the fire area and having its air passage connected with said air cham ber, and means for mounting said units comprising grate-rods having squared portions taking through squared holes in said units and grate frame for supporting said grate-rods.

3. A grate of the type described compris-. ing a plurality of grate units each unit formed of two integral cylindrical bodies of difierent diameters but of equal axial lengths, whereby the same may be arranged I right and left to form a substantially closed grate, said units having internal, cylindrical air chambers closed down at their ends to square openings to fit over the squared portions of grate-rods, air ducts arranged radially to permit ingress and egress of air from said air chambers, an air-feeding stem extending from the cylindrical portion having the greater diameter for feeding air from said air chamber into the bed of fuel,

grate frame and grate-rods journaled there in, said bars taking through said squared openings in said units, and notches cut into the sides of said cylindrical portions having the greater diameter whereby, When said units are rocked or partially rotated by rotation of their grate-rods, said notches Willform openings in said grate through which ashes may pass.

4. A grate of the type described comprising a plurality of grate units each unit formed of tWo integral cylindrical bodies of different diameters but of equal axial lengths, Whereby the same may be arranged right and left to form a substantially closed grate, said units having internal, cylindrical air chambers closed doWn at their ends to square openings to fit over the squared portions of grate-rods, air ducts arranged radially to permit ingress and egress of air from said air chambers, an air feeding stem extending from the cylindrical portion having the greater diameter for feeding air from said chamber into the bed of fuel, grate frame and grate-rods journaled therein, said bars taking through said squared openings in said units whereby, When said units are turned slightly in the direction opposite to that which producesopenings for the discharge of ashes, the said air-feeding stems are swung from a vertical position to adapt theirdischarge of air to a thinner bed of fuel upon the grate.

THOMAS K. NAFUS. Witnesses:

Mrs. VVINIFRED L. SOHUMEISTER, Mrs. F. H. WEIGEL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. C. 

